Improvement in cook-stoves



A. S. DUNHAM.

Cook Stove.

Patented Oct. 3, 1865.

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UNITED STATES PATENT (DEEICE.

ALBERT S. DUNHAM, OF TAUNTON, MASSACHUSETTS.

IMPROVEMENT IN COOK-STOVES.

To all fwhom 'it may concern:

Be it known that I, ALBERT S. DUNHAM, of Taunton,in the county ofBristol, in the State of Massachusetts, have invented certain new anduseful Improvements in Cooking-Stoves; and I do hereby declare thefollowing is a full, clear, and exact description of the same, referencebeing had to the accompanying drawings, making a partof thisspecification, in which- Figure l represents a vertical section throughthe center of the stove at z z, Fig. 2. Fig. 2 shows a horizontalsection through at the red line :v fr, Fig. l. Fig. 3 shows an enlargeddetached view of the self-closing valve, whichis opened by closing theoven-door.

The object of myinvention is to convey pure heated air into and aroundsuch portions of the stove-oven as the flame or gaseous heat from thefuel cannot well be brought in contact with for baking purposes, andalso to heat and radiate pure hot airinto the room from cookingstoveswhen not required for baking.

Myinven tion consists in the construction and mode of placing chambersto receive or draw in the pure air ou bot-h sides of the front end ofthe cook-stove above the grate or place for the fuel, the same extendingin the rear, connecting with a iiue or pipe to convey the pure heatedair over or into the top of the oven or through the oven-doors.

To enable others skilled in the art to make and use myimprovedcooking-stove, I will describe it in detail, referring to the drawingsand to the letters of reference marked thereon.

The main bodyAAA of the cook-stove may be of any desired size, form, orpattern. At the top of the stove, on both sides, at the ends of thetire-chamber B, are openings wa to admit the cold air into chambers bi), where it is in close contact with the re in the hre-box B, andbecomes hot, when it forms a strong current into the line or air-channel c c, which is so placed over and in the rear of the iire-box B as toget the greatest heat. The two currents of air from the sides, hereuniting, are conducted through the air iiue D, over the oven E, into thepipe or flue d, where it divides again right and left and is conveyedinto the vertical iiues F F, they having a series of small holes, f f ff f, near the back of the oven,which The ovendoors G G are cast dishingor sunk` sufcient to ad niitof being double-plated. The inner plate,g,may be of sheet-iron, and enough short of the ange or outer edge ofthe door to leave an opening, h, which will lit on and close over theseries of holes fffff in the stove, at the back pla-te of the oven,'whenthe oven-door is shut up, thus forming a flue, k k, communicating withthe vertical iiue F through the oven-door longitudinally to the narrowend, where there is another slit or opening, J,simi lar to the openingh, the opening J fitting on and closing over another series of holes, ee ec, on the side of the stove A, beneath the hearth C, the holes e e `ec communicating with the draft-flue H under the bottom of the stove, sothat when the stove-doors are closed the current of heated aircirculates through between the two plates of the ovendoor, and thusentirely surrounds the oven.

When the oven door is opened there is a hinged shutter or valve, I,which operates by its own gravity to close the holes e c e e and preventthe cold air from being drawn in or the gas or smoke from escaping. Vhenthe oven-door is shut to, the pin t', protruding from the inside ofthedoor, operates to open and hold the valve I open, as seen in Fig. 3, soas always to insure a current of air with the draft of the stove betweenthe two plates of the oven-doors.

The heated air may be let oft at the top of the stove by sliding thedamper b on the top ofthe air-channel c c between the boiler-places K K;or it may be let into the oven E by the sliding damper m on the underside of the top of the oven through the openings n n 'n n, communicatingwith the air-flue D; or it may be conveyed directlyinto the smoke-flue Mby opening the damper o near where it enters the pipe.

It has ever been regarded as one of the greatest defects in cookingstoves that they could not be so constructed as to get a uniform heat onall sides, and especially around the oven for baking purposes. Theoven-doors of the stove necessarily being about one-third of the surfaceof the oven, and no heat coming in contact with the outside of theplate, it only served to emit or radiate the hoatfrom within, so thatthe portion of anything that came near the doors would bake slake, whilethe other portions would be brown.

It will readily be seen that by my mode of constructing the chambers forreceiving the pure air and the arrangement of placing them so that theair circulating in them may be intensely heated without beingimpregnated with the gases from the fuel, and conducted into the oven,or conveyed over such portions of' the oven as the gaseous heat or amefrom the fuel cannot be used,and also radiated into the roomforthepurpose of equalizing the lem perature, there is great economy inthe use ot' fuel, and that the baking in the oven of the cook-stove thusconstructed will be done with greater facility and as perfectly as anyof the other modes of cooking.

In the above-described cooking-stove I do not claim radiating pureheated air into the room, nor do I claim the construction ofdouble-plate oven-doors for circulating heated air from the re throughthem, that device having been known-and in use long enough to becomecommon property by the expiration of a patent granted to Hosea N.Huntley, November 25, 1851.

Having thus fully described my invention and improvements in cookingstoves, what I claim as new, and desire to secure by Letters Patent, is-

l. The construction of the air-chambers and placing them at each end, atthe top ofthe fireboX, to draw in the pure air to be heated and conveyedinto the oven or through between the plates of the oven-doors, as hereindescribed, for the purposes set forth. 1

2. The arrangement of the air-chambers, ues, and dampers, whereby theatmospheric air can he heated and circulated without becomingimpregnated With the gases from the fuel, to facilitate baking in cookstoves, as herein described.

In testimony whereof'I hereunto set my hand uns 2d any of May, 1865.

ALBERT S. DNHAM.

Witnesses:

EGBERT R. ROBINSON, MARTHA J. DUNHAM.

